Move ctfeCompile to a visitor class
Fix inliner bug that manifests on 12095's test case
Fix Issue 12095 - Wrong code with -O -inline
Merge pull request #3231 from yebblies/issue12095

Issue 12095 - Wrong code with -O -inline
Merge pull request #3234 from yebblies/ctfecompile

[DDMD] [refactor] Move ctfeCompile to a visitor class
Fix associative arrays
Fix Issue 12094 - typeof(null) should convert to reference types